Question: Timmy has a course at PSU. Therefore, he needs to spend 9 minutes walking from home to the bus station and then takes the bus

Timmy has a course at PSU. Therefore, he needs to spend 9 minutes

walking from home to the bus station and then takes the bus directly

to the school. He has already known that the time interval between

two buses follows an exponential distribution with the mean of 20

minutes. If Timmy needs to take the bus before 10:40 AM in order not

to be late for the course, when should Timmy leave from home at the

latest so that he has 0.9 probability not to be late for school? (ln10=2.3)

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